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6 BASIC INSTRUCTIONS
6.7 I/O Refresh Instructions
6.7.1 I/O Refresh (RFS, RFSP)
Internal Devices
Set
(System, User)
Data
Bit
Word
S
(Only X, Y)
n
[Instruction Symbol] [Execution Condition]
RFS
RFSP
[Set Data]
Set Data
S
n
[Functions]
(1) Refreshes only the device being scanned during a scan, and functions to fetch input from
external sources or to output data to an output module.
(2) Fetching of input from or sending output to an external source is conducted in batch only after
the execution of an END instruction, so it is not possible to output a pulse signal to an outside
source during the execution of a scan.
When a refresh operation is conducted, inputs (X) or outputs (Y) of the device numbers
relevant to the program being executed are forcibly refreshed, so it is possible to output a
pulse signal to an external source during a scan.
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MELSECNET/10(H)
File
Direct J \
Register
Bit
Command
Command
Head device number of the device that will conduct refresh operation
Number of points to be refreshed
QCPU
PLC CPU
Basic
High Performance
Usable Devices
Special
Function
Module
Word
U \G
RFS
RFSP
Meaning
MELSEC-Q/QnA
QnA
Process CPU
Index
Constant
Register
Other
K, H
Zn
n
S
n
S
Data Type
Bit
BIN 16 bits
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Q4AR
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